Area and depth quantity tables
Metric and US area-by-depth volume relationships, with density and allowance kept separate.
A practical field toolbox
Free construction, quantity, level and setting-out tools built for site use.
Fast, mobile-first checks for foremen, supervisors, groundworkers, site managers, contractors, engineers and surveyors. No account or project upload is required.
Twenty-three free tools
Find the calculation you need
Search by task, filter a category, save favourites on this device or reopen a recently used tool.
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Recently used
Areas, materials and loads
Measure footprints, estimate quantities and record deliveries.
Sketch Area, Volume & Material
Quick shapes, scaled phone sketches and measured convex polygons with material and load outputs.
Open flagship toolGravel, Asphalt + Material Quantity
Estimate gravel, asphalt, Type 1, 6F2, concrete, sand and topsoil volume, weight and loads.
Open calculatorStockpile Volume + Weight
Estimate cones, frustums, rectangular piles and windrows in the selected measurement system.
Open calculatorVariable Width and Depth Strip
Average-end-area quantities for roads, paths, drainage runs and changing strips.
Open calculatorEarthwork Cut + Fill Volume
Area-depth or cross-section volumes with reuse, loose import, export and load planning.
Open calculatorMaterial Delivery and Load Tracker
Track local job targets, delivery tickets, cumulative quantity and remaining loads.
Open field trackerLevels and setting out
Check diagonals, calculate cut or fill and work with chainage.
Square-Up and Diagonal Checker
Expected diagonals, tolerance checks, scalable 3-4-5 triangles and missing sides.
Open checkerLevel Book and Cut/Fill
Simple design comparisons or height-of-instrument level sheets with local CSV records.
Open level bookLevel Interpolation Schedule
Generate intermediate design levels at regular chainage intervals.
Open calculatorChainage + Offset → Coordinate
Calculate an Easting and Northing from a baseline, chainage and signed offset.
Open calculatorCoordinate → Chainage + Offset
Project a coordinate onto a baseline and return chainage, offset and foot point.
Open calculatorDrainage and trenches
Falls, inverts, excavation, pipe bedding, surround and backfill.
Drainage Gradient + Inverts
Calculate fall, ratio, percentage, depths and downstream invert.
Open calculatorManhole Schedule Gradient Checker
Check coordinates, plan lengths, inverts, gradients, depths and connected-run continuity.
Open checkerTrench + Spoil Loads
Estimate excavation, loose spoil after bulking, mass and vehicle loads.
Open calculatorPipe Bedding, Surround and Backfill
Separate excavation, pipe displacement, bedding, surround, backfill and spoil.
Open calculatorCoordinates and surveying
Independent geometry checks using explicit Easting and Northing conventions.
Plot Coordinate Checker
Check dimensions, diagonals, angles, parallelism and squareness from coordinates.
Open checkerEasting/Northing Distance + Bearing
Calculate horizontal distance and whole-circle bearing between two coordinate points.
Open calculatorPolygon Area from Coordinates
Plan area, perimeter and centroid from ordered Easting/Northing coordinates.
Open calculatorConcrete and groundworks
Pour quantities and practical groundworks estimates.
Converters and quick checks
Purpose-built conversions with clear source and destination units.
Gradient Converter
Convert between 1:n ratio, percentage, degrees and millimetres per metre.
Open converterConstruction Unit Converter
Convert metric, US customary and British long-ton units only where intentional.
Open converterFeet + Inches Calculator
Add or subtract feet, inches and tape fractions, or scale one length and convert it to metric.
Open calculatorPrintable field references
Check common quantities and gradients without a form
Use exact tables for a quick independent check, print them for site or download the source values as CSV.
Gradient and fall tables
Convert common 1:n ratios to percent, degrees, mm per metre and inches per foot, with worked fall examples.
Rebar size and weight table
Check nominal metric and US reinforcing-bar diameters and mass per unit length, then download the table as CSV.
Calculate an exact project value
Enter arbitrary values in the interactive material, gradient and drainage tools when a reference row is not enough.
Why this site
Practical, transparent and independent
The tools solve focused field problems without an account, database or paid API.
Local processing
Project inputs, sketches and saved work are handled on the device rather than submitted to a server.
Transparent formulae
Each calculator states its convention, assumptions and limitations so the result can be checked.
Offline-ready PWA
After the first online visit, cached tools can be installed and used when the connection is unreliable.